DokuWiki is a standards-compliant, simple-to-use
Wiki mainly aimed at creating documentation of any
kind. It is targeted at developer teams,
workgroups, and small companies. It has a simple
but powerful syntax which makes sure the datafiles
remain readable outside the Wiki, and eases the
creation of structured texts. All data is stored
in plain text files, so no database is needed

Tiki Wiki CMS Groupware is a full-featured, Web-based, multilingual, tightly integrated, all-in-one wiki, CMS, and groupware. Tiki can be used to create all kinds of Web applications, sites, portals, knowledge bases, intranets, and extranets. Tiki offers a very large number of features "out-of-the-box". It is highly configurable and modular. All features are optional and administered via a Web-based interface. Major features include a robust wiki engine, news articles, discussion forums, newsletters, blogs, file and image galleries, bug and issue trackers, a link directory, polls/surveys and quizzes, FAQs, a banner management system, calendar, maps, mobile access, RSS feeds, a category system, tags, an advanced themeing engine (Smarty), spreadsheet, live support, shoutbox, inter-user messaging, menu generator, advanced permission system for users and groups, internal search engine, external authentication support, and more. It was formerly named TikiWiki.

PHP is a widely-used Open Source general-purpose scripting language that is especially suited for Web development and can be embedded into HTML. Its syntax draws upon C, Java, and Perl, and is easy to learn. PHP runs on many different platforms and can be used as a standalone executable or as a module under a variety of Web servers. It has excellent support for databases, XML, LDAP, IMAP, Java, various Internet protocols, and general data manipulation, and is extensible via its powerful API. It is actively developed and supported by a talented and energetic international team. Numerous Open Source and commercial PHP-based application packages are available.

b2evolution, is a multi-lingual, multi-user,
multi-blog engine. It was developed to provide a
free, feature rich, extensible, and
easy-to-install solution for efficient Web
publishing of information ranging from
professional news feeds to personal weblogs. b2evo
can easily be installed on almost any LAMP (Linux,
Apache, MySQL, PHP) host in a matter of minutes.

FUDforum is a templatable forum with i18n support based on PHP and either MySQL, Oracle, PostgreSQL, or SQLite. It features a user/group management system, a multi-lingual spell checker, both flat and thread message views, a private messaging system with multi-user forwarding capabilities, poll file attachments, and much more. It is an extremely fast and scalable forum that can fulfil the needs of both small and large forum operators.

A WikiWikiWeb is a collaborative hypertext environment, with an emphasis on easy access to and modification of information. MoinMoin is a Python WikiClone that allows you to easily set up your own wiki, only requiring a Web server and a Python installation.

Drupal is a modular content management system, forum, blogging and community engine. It is database driven and can be used with MySQL, MariaDB, PostgreSQL, and SQLite. Its features include (but are not limited to) discussion forums, Web-based administration, theme support, a submission queue, content rating, content versioning, taxonomy support, user management with a fine-grained permission system based on user roles (groups), error logging, support for content syndication, locale support, and much more. It is considered to be an excellent platform for developers due to its clean code and extensibility, and it can also be used as a Web application framework.

XWiki is a WikiWiki clone written in Java that supports many popular features of other Wikis like the Wiki syntax, version control, attachments, security, and searching, but also many advanced features like templates, database and dynamic development using scripting languages (Velocity, Groovy, Ruby, Python, PHP, and more), an extension system and skinability, J2EE scalability, an XML/RPC remote API, statistics, RSS feeds, PDF exporting, WYSIWYG editing, an Office viewer and importer, and a lot more.

Piwigo is photo gallery system for the Web. The project started in 2002 and is built by an active community of users and developers. It comes with powerful features for publishing and managing your photos, scalability, and smart browsing capabilities such as albums, tags, or calendars. Extensions make Piwigo even more customizable.